Network & Email · page 6

Fires random CIDR, dotted-mask, and wildcard conversion questions with instant scoring.

Drills 8-bit binary to dotted-decimal octet conversion with per-question explanations.

Runs timed subnetting questions with streak, accuracy, and personal-best scoring.

Combines pasted CIDR blocks into the shortest list of covering supernets.

Divides one prefix into N equal child subnets with ranges and broadcasts.

Converts start-end address ranges into the minimal covering CIDR list.

Allocates subnets largest-first from a base block against a host-count table.

Flags overlapping and duplicate blocks in a pasted CIDR list.

Renders a /8-to-/32 table of masks, wildcards, block sizes, and host counts.

Prints block-size deltas per prefix so last-octet math stays mental.

Generates in-addr.arpa or ip6.arpa records for a given prefix.

Splits a /24 reverse zone into delegated smaller slices with NS rows.

Verifies a gateway and host IPs sit inside one subnet under one mask.

Finds the smallest prefix that satisfies a required usable-host count.

Replans prefixes after applying a growth percentage to host requirements.

Assigns fe80::/64 segments per VLAN and interface in a tidy table.

Assigns private blocks to sites and departments with a spare-block ledger.

Subdivides 100.64.0.0/10 into per-site translation pools with port notes.

Sizes NAT pools from concurrent users, ports per session, and timeout math.

Computes port-per-user ratios from pool size and flow arrival rates.

Finds unassigned holes between allocations in a pasted IPAM export.

Groups subnets into named security zones ready for policy design.

Plans RFC 3021 /31 links for router point-to-point addressing.

Shows an address and mask as aligned binary octets with network bits highlighted.